var formula = "{field1}-{field2}";
search.create({
type: search.Type.TRANSACTION,
title: 'Title of the search',
id: 'search_id',
columns: [
{name: 'trandate'},
{name: 'entity',join: 'appliedToTransaction'}
],
filters: [
{name: 'type', operator: 'anyof', values: ['Mention Transaction type here (sales order, purchase order, etc)'] },
{name: 'type', join: 'appliedToTransaction',operator: 'anyof', values: ['CustInvc']},
{name: 'formulanumeric',operator: 'GREATERTHAN',values: 0,formula: formula}
]
});